GPRS Shield and Arduino


I am looking for integrated Arduino UNO, GPRS sheild and GPS Shield as mentioned below.

Arduino UNO is connected with GPRS Shield which in turn will connect to GPS Sheild. Where all the three tx and rx pins are in serial.

In this scenario how will we transmit and receive data to/from Ardunio Uno to GPS and GPRS modules.

Please let me know how to do this. let me know if you need further details to answer my query.

Thank you.